a Sum of primary consumption, electricity, and electrical system energy losses categories.

b Sum of coal, natural gas, and petroleum categories.

c Consumed in the operation of pipelines, primarily in compressors, and small amounts consumed as vehicle fuel.

d Includes most nonutility use of fossil fuels to produce electricity and small amounts (about 0.1 quadrillion Btu per year since 1990) of renewable energy in the form of ethanol blended into motor gasoline.

e Incurred in the generation, transmission, and distribution of electricity plus plant use and unaccounted for electrical system energy losses.

f Beginning from 1980, small amounts of coal consumed for transportation are included in industrial sector consumption.

NOTES

Energy consumption (all sectors) differs from totals in table 4-2 for 1990 and subsequent years.